/**
*      author: Y_Yao
*      created: 2024-12-18 10:49:29
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 1e18;
const int INF = 0x3f3f3f3f;
const int N = 2e5 + 7;
string s;
int cnt[30];
int sum[30];
int ans = 0;

void solve()
{
    cin >> s;
    for(int k = 0;k < s.size();k++)
    {
        int cur = s[k] - 'A';
        ans += (k - 1) * cnt[cur] - sum[cur];
        cnt[cur]++;
        sum[cur] += k;
    }

    cout << ans << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}